Questions about Restoration T17 set bonuses

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I've been looking all over but can't really find any answers on the (to me) pretty vague set bonuses for resto. Hoping I could get an answer here!

2-set: You have a chance when you cast Chain Heal to cast a second Chain Heal at one of the targets healed.

Does anyone know the actual % of this proccing? And is this also affected by High Tide and ES/Riptide?

4-set: When you gain Tidal Waves, you have a 8% chance to reduce the mana cost of Chain Heal by 75% for 10 sec.

So can this only proc when you have either 0 or 1 stacks of tidal waves or can it also proc when refreshing tidal waves? And does this reduce the mana cost for every chain heal in the next 10 seconds or just for 1 chain heal?

And in general, how strong are these set bonuses? I think they're pretty decent with the only downside that it's purely RNG... Anyway, hope to see some answers finally!